“When you use Signal, your data is stored in encrypted form on your devices. The only information that is stored on the Signal servers for each account is the phone number you registered with, the date and time you joined the service, and the date you last logged on.”
I personally prefer apps on the matrix network! Www.Matrix.org has a list of client apps, but I’ve found Element is great on windows, steam deck, and android! Call quality and chat stability can get weird sometimes, but overall it’s very very secure and pretty feature rich! 🙂
From the little bit I researched, it’s kinda similar in the way that the fediverse works! It’s decentralized, and one account works everywhere. Good stuff!